...ERBB2-H878Y mutant had the highest sensitivity against lapatinib among all mutations tested with a cellular IC50 value nearly half to that of wild type ERBB2….Moreover, an ERBB2 mutant (H878Y) observed in 11% of hepatocellular carcinoma patients showed remarkable sensitivity to lapatinib indicating that lapatinib may be an attractive option in the future for hepatoma patients with ERBB2-H878Y.